400 



p. S. MARTIN 



c 



o 



15 



10 



5 



MARSUPIALS 



10 

 5 



M 



INSECTIVORES 



PI 



10 

 5 



M 

 RABBITS 



PI 



15 



10 



5 



'I 



M 



RODENTS 



— T- 

 Pl 



/ (40) 



10 

 5 



• I 



M F 



CETACEANS 



PI 



I I I 



M P PI 



Geological Epoch 



15 



10 



5 



EDENTATES 



(28) 



J 



M 



PI 



M 



PI 



10 

 5 



NOTOUNGULATES AND 

 LIPTOTERNS 



M P PI 



PROBOSCIDEANS 



10- 

 5" 



PERISSODACTYLS 



15 ■ 

 ID- 

 S' 



I I 



M P 



ARTIODACTYLS . . 

 I 



-T- 

 Pl 



M 



PI 



Fig. 5. Caption on facing page. 



